EdGe(161)

.ok ..so i actually had a chance to speak to the reputable John Vega of 5th gear down here in the Tampa area......

.... I told him bout my setup z6 -pauter rods/cp pistons block guard blah blah and he says "what are your goals and what turbo"...... when i told him im lookin for 350-400 to the wheels out of a precision sc61 he said "turbos alil' big for that single cam"
WTF i've heard from multiple people that the sc61 is a hell of a great turbo if you can deal with a little lag.... i also told him i plan on running open downpipe and a mini-ram (go-autoworks) style... merge collector supposedly helps harmonize exhaust gases entering the housing...... but i want to be able to run the car on 93 so 20+ psi is out of the question thats why i sold the t3/to4E

OK real world experience people I NEED YOUYR HELP/FEEDBACK i've been told youll see a z6 hit full boost on an sc61 by 5000rpm Mr. Vega says its more like 7000

Also my dealer says the sc61 is avail in ballbearing so maybe thats my route? im soo close to finishing i just need to know what the hell to expect........ ps while im at what do you guys like better for springs/ret. supertech or crower?

Thanks- ejv

TheShodan

iTrader: (14)

He's actually right. Its because of the fact that the cylinder head is just not efficient to get a good torqueband out of that turbo without hitting close between 5000-7000rpm mark. Running a big turbo to get big power on low boost means that you need an efficient engine setup that can move that exhaust energy that it expels. (So many in FL want the world out of pump gas, but will spend mad money on a Nitrous kit... What's going on down there?)

Anyway, running a "ball-bearing" version of that won't help if there's no change in the aerodynamics of the turbine wheel. It may help but only minimally.

The SC61 is a good turbo if you can handle a little "lag". In your case its more than a "little". If you must look to Precision, I would look to their 6062 billet turbocharger as opposed to the SC61. We've had a few decent results with that turbo on less-than-fully-efficient heads that can make over 385whp with 93 octane, and is a bit more responsive than the SC61 due to its relative smaller size and better aerodynamics.

And yes, this is because we've used it in the real world.

EdGe(161)

. . .Thanks for the honest reply its sometimes tough to get an educated answer.......... while your on the topic of the 6062, John did happen to mention the billet 58-57... would you happen to know the primary differences between that and the one you had mentioned ... i am somewhat partial to precision but i am definetly open to ALL recommendations as long as their is solid evidence to back it up.....

......as for florida if your not already here....you cannot imagine just how ridiculous it can be...

TheShodan

iTrader: (14)

I've had a few clients that are down there, and just love the laughing gas with turbo.

VtecCarHauler

AR Perfomance's Ek started out with a SC61 made 504whp@25+psi D16z6 head Y8 block. I think the back housing was a .82 it wasn't super laggy but the engine had a decent cam which I think helps alot. The 6062 and the new series of Precision turbos are really making some good numbers. For 400whp max a 57trim or 60 trim will be good enough but if you plan on making more in the future you could step up from now. 500whp is not a problem with a piston and rod stock sleeve D-series block.

EdGe(161)

Well after a few helpful recommendations and a little research it looks like the precision billet 58/57 is what ill be going for ................
...just a quick question are there anyreal advantages with going with a larger cmp cover ? their e- cover has a 3" inlet and a 2" discharge while the s-cover has a 4"in inlet and 2.5" discharge how would spool vary between the two, if at all?


thanks for all the help

TheShodan

iTrader: (14)

It depends upon the wheel used. In this case, if you've decided with the 5857, just use the E cover. Better fitment, and easier to use in response. Good luck

Boosted-EH-804

Damn i keep seeing this about the sc61 hmm hoping my built head and nice cam will help to spool this sucker a little better plus its a track car....Exactly what SC61 where you looking at the 6152?

Autoworks

I agree with Shodan (who seems to consistantly give pretty good info from what I've read on HT)
The SC61 is a little big, but will work. It really depends on where you want your power at. I wouldn't select it for a real street car type setup looking for a wide and linear power ban. It won't really wake up until around 5k, and from my experience comes in pretty hard. I personally didn't mind the "lag", but most customers would rather not have it.

Here's one of my old sheets on WG at 10psi. SC6152 .63 a/r 9:1 D16Z6 with our Mini Ram setup...

d16z6Tcrx

i had an sc61 .63 a/r on my built yb back in 06 and i loved it. hit full boost of 15psi at 5200 and pulled its hard till redline. i dont think its too big of a turbo at all. its not that much bigger than the 60-1 that most sohc users are running not. a big turbo can work very well if setup properly.

oneludesol

you would love a GT28RS on that setup.

to put things in perspective, im running a 61 on my setup (over 2.5L) and the head is WORKED, i still don't see full boost until 4500ish

Kyle R

iTrader: (1)

Yeah the 61 is a large turbo for your setup. If you don't mind the lag, then go for it.

lyncoors

I WOULD GO 5857

EdGe(161)

.......hmmm looks like this room is divided with an equal amount of people standing on either side..... i still think billet compressor wheels are awesome and the 5857 has been recommended by numerous people, now is it worth the extra money for BB?

autoworks thanks for the information....your products are top notch

alpha

TheShodan, you're not joking. MOST down in Florida are dead set on 450+whp on 93 octane with stock cylinder heads, small turbines, log manifolds, etc.

Is John Vega tuning your car? If so, he's really the only person you need to talk to. I'm sure he has tuned more than enough singles cams to give you an honest answer/opinion. The SC61 does bring a bit of lag with a single cam. Everyone is different with lag though

EdGe(161)

...yes he is, and yes i know he has quite the reputation as far as being one of the better tuners in the area. So i tend to shut my mouth and listen when he speaks

ScorpionT

The 5557 would be more appropriate for 400whp, especially with proper headwork.